CONSOLIDATED BALANCE SHEET (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets
Fixed maturity investments, at fair value	$ 4,988.7	$ 5,030.5
Short-term investments, at amortized cost (which approximates fair value)	674.0	635.9
Common equity securities, at fair value	1,174.6	1,156.8
Convertible fixed maturity investments, at fair value	73.8	80.5
Other long-term investments	302.3	288.9
Total investments	7,213.4	7,192.6
Cash (restricted: $22.2 and $56.1)	338.6	382.8
Reinsurance recoverable on unpaid losses	425.2	428.1
Reinsurance recoverable on paid losses	15.2	25.4
Insurance and reinsurance premiums receivable	734.8	518.9
Funds held by ceding companies	93.8	106.3
Investments in unconsolidated affiliates	373.3	321.4
Deferred acquisition costs	190.0	174.7
Deferred tax asset	484.9	512.1
Ceded unearned insurance and reinsurance premiums	149.5	92.4
Accrued investment income	37.0	39.3
Accounts receivable on unsettled investment sales	19.9	12.1
Other assets	537.7	458.1
Assets held for sale	1,803.1	1,880.1
Total assets	12,416.4	12,144.3
Liabilities
Loss and loss adjustment expense reserves	3,048.4	3,079.3
Unearned insurance and reinsurance premiums	1,116.6	901.4
Variable annuity benefit guarantee	54.1	52.8
Debt	677.6	676.4
Deferred tax liability	353.9	356.2
Accrued incentive compensation	124.9	218.3
Ceded reinsurance payable	157.9	71.9
Funds held under insurance and reinsurance contracts	127.8	127.1
Accounts payable on unsettled investment purchases	80.9	20.5
Other liabilities	343.3	362.9
Liabilities held for sale	1,803.1	1,880.1
Total liabilities	7,888.5	7,746.9
White Mountains’s common shareholders’ equity
White Mountains’ common shares	6.2	6.2
Paid-in surplus	1,046.7	1,044.9
Retained earnings	2,880.8	2,802.3
Accumulated other comprehensive income (loss), after tax:
Equity in net unrealized losses from investments in Symetra common shares	(3.9)	(40.4)
Net unrealized foreign currency translation gains	80.5	88.4
Pension liability and other	4.2	4.1
Total White Mountains’s common shareholders’ equity	4,014.5	3,905.5
Non-controlling interests
Total non-controlling interests	513.4	491.9
Total equity	4,527.9	4,397.4
Total liabilities and equity	12,416.4	12,144.3
OneBeacon
Non-controlling interests
Total non-controlling interests	279.2	273.7
Sirius Group
Non-controlling interests
Total non-controlling interests	250.0	250.0
HG Global
Non-controlling interests
Total non-controlling interests	18.4	16.6
BAM
Non-controlling interests
Total non-controlling interests	(102.7)	(97.6)
Other Noncontrolling Interest [Member]
Non-controlling interests
Total non-controlling interests	$ 68.5	$ 49.2